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Finding the Fourth Proportional to 128,652.80, 177,541.60 and 72,064

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Solution

The fourth proportional to 128,652.80, 177,541.60 and 72,064 is: 99,448.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,652.80 : 177,541.60 = 72,064 : x
  2. Step 2: Convert to fraction form
    128,652.80/177,541.60 = 72,064/x
  3. Step 3: Cross multiply
    128,652.80x = 177,541.60 × 72,064
  4. Step 4: Simplify right side
    128,652.80x = 12,794,357,862.40
  5. Step 5: Solve for x
    x = 12,794,357,862.40/128,652.80
  6. Step 6: Final answer
    x = 99,448.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.